NSMutableCharacterSetMBS class

Function:
The NSMutableCharacterSet class declares the programmatic interface to objects that manage a modifiable set of Unicode characters. Notes:
You can add or remove characters from a mutable character set as numeric values in NSRange structures or as character values in strings, combine character sets by union or intersection, and invert a character set.

Mutable character sets are less efficient to use than immutable character sets. If you don't need to change a character set after creating it, create an immutable copy with copy and use that.

NSMutableCharacterSet defines no primitive methods. Subclasses must implement all methods declared by this class in addition to the primitives of NSCharacterSet. They must also implement mutableCopy.
Subclass of the NSCharacterSetMBS class.